Text rendering, and Savegames

I got all the text rendering to work correctly, and even had some time to spare this weekend.
All UI is there now. It might need a polishing round at some point, but everything is fully functional and wired up.

Now that you can see you progress
it was a bit sad that you had to start over every time you closed the game.
Not anymore. Save games are now persisted between sessions.

And just because we can: We tossed in a native M1 build as well.
The binary is slightly bigger than needed, but that will be fixed before the release.

As always:
Please test, and let me know what you would like to see next.